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Subject: Re: [PATCH V3 17/30] x86/sgx: Support modifying SGX page type
From:   Jarkko Sakkinen <jarkko@kernel.org>
To:     Reinette Chatre <reinette.chatre@intel.com>
Cc:     dave.hansen@linux.intel.com, tglx@linutronix.de, bp@alien8.de,
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        x86@kernel.org, seanjc@google.com, kai.huang@intel.com,
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        haitao.huang@intel.com, mark.shanahan@intel.com, hpa@zytor.com,
        linux-kernel@vger.kernel.org
Date:   Tue, 05 Apr 2022 21:41:34 +0300
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On Tue, 2022-04-05 at 10:05 -0700, Reinette Chatre wrote:
> Hi Jarkko,
>=20
> On 4/5/2022 8:34 AM, Jarkko Sakkinen wrote:
> > On Tue, 2022-04-05 at 10:06 +0300, Jarkko Sakkinen wrote:
>=20
> > > >=20
> > >=20
> > > To be coherent with other names, this should be
> > > SGX_IOC_ENCLAVE_MODIFY_TYPES.
>=20
> This is not such a clear change request to me:
>=20
> SGX_IOC_ENCLAVE_ADD_PAGES - add multiple pages
> SGX_IOC_ENCLAVE_RESTRICT_PERMISSIONS - restrict multiple permissions
> SGX_IOC_ENCLAVE_REMOVE_PAGES - remove multiple pages
> SGX_IOC_ENCLAVE_MODIFY_TYPE - set a single type
>=20
> Perhaps it should rather be SGX_IOC_ENCLAVE_SET_TYPE to indicate that
> there is a single target type as opposed to the possibility
> of multiple source types (TCS and regular pages can be trimmed).
>=20
> >=20
> > This should take only page type given that flags are zeroed:
> >=20
> > EPCM(DS:RCX).R :=3D 0;
> > EPCM(DS:RCX).W :=3D 0;
> > EPCM(DS:RCX).X :=3D 0;=20
> >=20
>=20
> ok, this was how it was done in V1 [1] and I can go back to that.

I would name the fields as "flags" and "page_type" just to align
names with SGX instead of trying to mimim "posix names". Otherwise,=C2=A0
I support that.

BR, Jarkko